PS: About subtitles, this for the mentioned “new” Youtube-version isn’t something that might be lying around in the dust on the www, right? I find some of the “local” european (etc) actors’ accents a bit hard to understand comfortably (but at the same making it authentic in a good way naturally, which is one of many great things about this series)!
If I read this correctly, you are looking for subtitles of the YT episodes? I believe the YT versions have English subtitles available that you can activate and would be downloaded alongside the video if archiving with something like Jdownloader. At least that’s the case in my region.
If you’re looking for other subtitles, I’m not sure where to direct you unfortunately.